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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33576f5eb08f40f043d6b10fc8c81d55deb31da2745feff6d664eccacc69e18e' 
  AND token = '9c7g0yLks3Q4VYHmL9AGzBemBFIdIzpouxzxNwq7vEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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