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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fa01ed4485ceae7752c2654a1339c6e59e7e0be8c9e11cd56eae9ddcf045e0' 
  AND token = 'C1n0NQ57tOAE28mrtlIVyJqtSthNhPI3GZ06ywKorME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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