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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23d9f9f070dc1b34822c6813a4434abd0015eed5b6a18e43a46493ad0b605a9' 
  AND token = 'anyBD8GnK9LXLHt4Xfp5F8tjU8wt62M09UlVEXFy9CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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