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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60797912121ddb232c5aa15accd83c3fe7a4964d6cc846c43b74d7707a546bdb' 
  AND token = '7t2A1dIVnDnayNKP/xu2t5RvP90OK9sbZMNwUwibF+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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