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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1930d55dc0630dda4b3d63e70953e333197c9a46bcc4e050c15b9fac64ee7dd0' 
  AND token = '/1oaJf/KBMjxdBIWvgGuV7kmiInYBC+Kwb23kD1+pcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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