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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e1ef6072ec0947fa9b9bbfb0ef6560b32ea00675b6b9a087ecc89c944e8c2d3' 
  AND token = 'oXAc1qwFNUutHphFqsztCobq7MdPxByNvx3mxsK7AL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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