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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de388adbf809eefd73cb52d74ed19512c5782c31afd38be13ae7212ddd2aecb' 
  AND token = 'vegx6Mws+YvKr+cQMp23B8+1Gqud0IT85r4qe9DBGE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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