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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c7547cf54f1176f4a633991f7266f9eeffe43240c9b7e93b41b3874e4f000d' 
  AND token = 'r584sslcownwcXRAB86nXJmVSK8Kd5ljmXR9ecITFmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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