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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653c8b8fb6293b24481bf61e874e34012cdce90404a8ad67d5dec84dd806d25c' 
  AND token = '7aSBkGph48BI1xn3Ej3BTkG7ImL7+MvSTsXW5WhMPsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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