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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d3d94d2b9736ed3262c18dc6c40a7e562bd1583289c51108014267b575eb7d' 
  AND token = 'cbVXfHgF4VB4/tdVDvLy9Dt80KCg2yH35eaZT+Aw3bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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