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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb946dfb70fbd30d39aae3449e5a2c82b67692690a94bc46011d7babb35a1ed' 
  AND token = '3NCvLHdNUvHPA58qTBDiFxFLEIwB8hDAGt6XczGxqC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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