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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabc23f7a1fc4b7160a6975e0a293369128af11fbb96bb47537fff8fa93362bc' 
  AND token = 'jeX6g5UYGxiCTdGGWhQLJTN0WPQj4w3CMOgMa7AYSLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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