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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dfbfdae4b3bd23602f5ec5cd2a0f9a17101181820e19d29b70427b4e0f8c21' 
  AND token = 'Ni7NSWtWTL3zjYxVCaCiQ7yV30iRmlT+iV3u89GUROU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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