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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b75818a65161d76324d093934643f68986f668968cf5269f742886deb5bb2be' 
  AND token = '/xZroEy5f7YQpzGc651gK7yavw8ootqVLwr2cxeX0uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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