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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9dad1abf46e38c28a50343d4328c117e8c2e4a97744872750fff453642fff2a' 
  AND token = 'NQYOvBlotcc3t2I016YuIDnurS/mW9K49p2/fK063RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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