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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee73f48b381ee56c1d1cb70c521f0f49c717df6e1d8ba8042b67562edcc9834' 
  AND token = '7eTJqqkNMLvVLZLAzSRVngqNemLf+dvarVyprZ3C/RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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