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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ff5536e3b43a0d12d0bee25c488e8a327d5aca75ba8ac6f4a61b4f50cda57f' 
  AND token = 'RFWsx8TXiUAdpPJyrg4zgaLMa08rly/4u8PwEMmy4lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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