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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021e85323892b3a761f28d31483ea1ff8a5986a3f8c1641a691d17f97b8ac99d' 
  AND token = 'O86udAKzBJJbvLit2/6nIb5WHfErRZA8pVDbX3Th3ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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