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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36aeef3d7dcb324b576263efe10b63799ea6fdb22ada8bd4297b29e36a48cd4' 
  AND token = 'TBEoY88rVWccxubIH0gqvm3xQhCmThG1TBpT1ehTNNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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