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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6d60576aa5ed3be26cff88944cbdb50712629112f8f5f78ec53eb127e4dc76' 
  AND token = '8kypU3YxY3N8fhRhO8kN2QAUh7JRJCngG87VY0crd9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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