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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccd92ffee8f7f83528ca80a6166f881af0e7b42429badbb7e8f199d2d35666e' 
  AND token = 'ivz8rbVN1ioqUlLObop1Q3p/EqGefQCGdqoG+E6Y2B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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