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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021593be934f7ea1f159447375a0b5aa9566a8aa832053b043efdf0713d7d382' 
  AND token = 'Pqu6BB/BNfuIWmkzT/6jZtqnuyf32Mc6b5AAL8oCcUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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