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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a05bb12a1cbc8b9a00494ccf43d3eb419cd033b4f893cf7d24f1f3e5fded7c3' 
  AND token = 'gQsiE1/NNvyklIhZx3hz7lssWS4NVtrA83W3noIPuBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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