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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c756340e3e6fb51c07c4e70c6045f6b202b8a63c2cf7e30b73c4d28dcbae801' 
  AND token = 'VtiXiihcOHhCq1GpnhtEz1Zo6Egq5OHvdZOJpipiFrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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