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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75ba3ab92d81e349d3d94134a427ce60de50be460221abf89f275eaabb84437d' 
  AND token = 'zmE/DS3yEtUIv0esAembvkZP8G82KKfvjCVn5Mb/zg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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