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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2088642e6a728bee43152d5cc101ad72f61642cb3c97e821de152f986aff85' 
  AND token = 'q01dCSXWB6+MtYZtHZPL8aftrmH9w0tbhDRnPPbaQ7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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