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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7f1054e9b7c6a726af88cbfd24dda8974657a015c6fc74a50f9df62a020b13' 
  AND token = 'UxX75CxLuO6AmauBJe58R+GqPC00wAZ++f5nafDmC+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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