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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5efc808675a5c35d7e372062d3920e66a5144e98ebdfe5195ad9a1cb3f2d649a' 
  AND token = 'l752jQP3oBd0wrvcbbiI9SOcIKEGFjTpqORFVM1Kulo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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