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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f82f5866b275733f8d3d48c60903173b822bf34689ed2b6ab290cf806e6668' 
  AND token = 'Wvla/0eFDVH72qbn/OAVIMxzN2qmfiq7ltiaksID29k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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