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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd079b3e6eb9225ab009d00a1250e81df596524c7a855c63e082206e47e39358e' 
  AND token = 'T5zLTPn9/Pk519ItKZIv2LCzEMZMK2hqLb2TKAROVL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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