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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab921e42e49d310c2ae0012862b1db469e153ad3a29411b528f6a1e311ecdcb5' 
  AND token = 'c3L1tqWeQLp1wNZ86Vj9CrJf9PP3+yeGFs7BYvnnGvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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