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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9fc61d4e1e9fea6f9a99837aefe6fd5809e03beca1ff8dc48f80f9d48bf55e' 
  AND token = 'x/eLc61IOuZS0TYG81WDMwCpDLem8sP7/qmnkzuyDa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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