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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acf16f1a46947eb83db20c57b2da981f593d17c350597c0e8f02aa6eabe578c' 
  AND token = '1ijZ9P4QZ4TiETQBkYUgs5EDxByg/LAZgjy/n5tjLx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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