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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a534d0bb34e8f2bc3b74f30d39bccae3597e8a8cdb1e20a98072cf8c37c82c25' 
  AND token = 'i6WQZsuXXkEBd4WPsmBXp/GAaOSl6vFGQFHFCQA8iZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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