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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd52edac55fe44e4d5d00ccfab3c47d978e569ad669fb87d404391d4761c95e' 
  AND token = 'D+dDd1afSk+X32CSg95aO3z/inMnpNORodvuf4QGtdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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