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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4ec188bf9209a7b98af797e68367c89471ca6a70cff0af9bea3250346fc99c' 
  AND token = '+ER8Qxw2/5MesDa5kKLVbfFE7+SQJJcBY86ij6hNK50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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