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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44f486ed6cd44f0561736397aab3df0de32a9dcdad3783c8078241a64bfb5f8' 
  AND token = 'oparGtrZdE+9mf1EmQ8Up47Xe3bnQYC2VWLHJqI+490=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}