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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb62cb5a61104dd62ed22f0e397f11b2fe8e5a006f6c25a2b9db0f440205cb1' 
  AND token = 'bri7twPCV/BM0gOLZBMyWMtHN3VYDjldZ+k1PRJyXEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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