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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf97612472c5df1c0d519ff3a323ef784ae6e3e1bec75d8e74677c581136dc8' 
  AND token = 'Ns8xCPnh9dBqkZKwl0kV32hQ5ldobN7X/oBMnjJyK4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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