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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bdb3c9aff6b28905111af636f187d60609914932c78cbd577ba2a35fda2e030' 
  AND token = 'F13ivZRCilsnEPRSfvhZf+d73tru8iHOOAvIAcM55XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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