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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b39521abd349bb532be673d4e48768d94783d51d9ed24fbbb66a0ae04989ed' 
  AND token = 'eXKv1DlwTJNJnEMdY38GOUbf7iYmLQetDrqXPuJX/0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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