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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9edd6173cb875900f26964a5a2a4a1ea4febfa691c5f0c225efaec67518f1b31' 
  AND token = '4wCTSXOsS3ZKR9M/HjWaBzHBZiWi5p7RRsNAY7ePgR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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