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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ca8f3b6777dfcace537fd1e110ac18aada3244a9b8ed8c35487954a6c168bb' 
  AND token = 'MBDX53ZJGNhwN06oJj6sL5+2shwt5gae/1MAqERq278=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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