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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bc7eb30a81e3f9623ba77c5d8a14c8c452ba44d305f66af0d093fd70cedf64' 
  AND token = 'kg5XMcVLHNHuiK3s1T4P9zl/iJtScM39rmqPa2jQIKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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