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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd962d9f2b0eeaebbbcc03cde3b28b826dc9efcbdd6d2d7e4581ca2f67a0598c9' 
  AND token = 'omjUHu3rk1WkatwuwSkyqbUBY/+2isN04rMyd9x8mHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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