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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cbfd7e84bc54e4c3bc4b6ddb87581a439999523b8b9545a8119f0bf1c2332e3' 
  AND token = 'tLRfMmHj+8kmxfXe0xFVBskXHN3iXLXSTViPhJCt6f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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