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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0ddac2f37dc2ea5b8d9d1d282fc5e837f6bd53359c302d1737ce0b6869bb1e' 
  AND token = 'RvltWqBQTn/AVVprYeAT0TxxBxkUYdtUTK7mG3Kh4u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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