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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd15aa716264526459b0545d54e6eb154cb010a29c87ec49177745177bb115a' 
  AND token = 'hcWP1vSDkFNT2Uj6lOamKOAxNaKQ59WiyG2VM+4ztu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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