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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eee776eb405712f8ade1e281581ebf7d739401f506e1aeaee5cbf1d50b0e3cd' 
  AND token = 'D1QFyA+Gj0PCr1bYvT7mrOSrV+Cq4Mhx6h72qVgI6ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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