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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f30872c9a1f1e804408b36a1418ecc50e4b93cf178b754c3c7cdbd1c59bc57' 
  AND token = 'ii20X97lXOwpbQWR5blEVnCZTSgmJRCKbqa55EFI7ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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