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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1316ac89dc53d11f5555c60acde65325d594436d71e672d70391e611c27d3aeb' 
  AND token = 'iT8phM0BXKpmtM4N/+1h6+2dmBVUBc+Rk/qHOT2WF/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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